NTPとchronyd
今すぐ同期悪い時、特定のスケジュールされたタスクの実行に影響を与えます
まず、即時時刻同期
この方法の一つ：
ntpdate ntp.aliyun.com方法2：再起動のNTPサービス
方法3：chronyサービスを再起動します
第二に、NTPおよび状態chronyを見ます
[root@textbox ~]# chronyc sources -v
210 Number of sources = 1
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* localhost 3 6 17 2 +62us[ +661us] +/- 88ms
[root@textbox ~]# [root@textbox ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*localhost 119.28.206.193 3 u 41 64 177 0.784 1.195 36562363つは、NTPサーバが行うように設定します
#注释原来的ntp服务器，原来的ntp服务器都是centos.org美国的
[root@textbox ~]# sed '/^server/s/^/#/' /etc/ntp.conf -i
#添加两个aliyun的
[root@textbox ~]# sed '1a server ntp.aliyun.com iburst' /etc/ntp.conf -i
[root@textbox ~]# sed '1a server ntp1.aliyun.com iburst' /etc/ntp.conf -i
#重启服务
[root@textbox ~]# systemctl restart ntpd
#ntp就这么简单，就可以当服务器使用了
[root@textbox ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
+120.25.115.20 10.137.53.7 2 u 4 64 17 42.560 -8.795 6.944
*203.107.6.88 100.107.25.114 2 u 4 64 17 15.542 -7.021 6.460
#123端口，udp
[root@textbox ~]# ss -lutnp | grep ntp
udp UNCONN 0 0 192.168.38.140:123 *:* users:(("ntpd",pid=61668,fd=19))
udp UNCONN 0 0 127.0.0.1:123 *:* users:(("ntpd",pid=61668,fd=18))
udp UNCONN 0 0 *:123 *:* users:(("ntpd",pid=61668,fd=16))
udp UNCONN 0 0 fe80::69d0:5288:fda9:93ae%ens33:123 :::* users:(("ntpd",pid=61668,fd=21))
udp UNCONN 0 0 ::1:123 :::* users:(("ntpd",pid=61668,fd=20))
udp UNCONN 0 0 :::123 :::* users:(("ntpd",pid=61668,fd=17))
#用另一台服务器测试
[root@linux5 ~]# ntpdate 192.168.38.140
5 Sep 09:17:25 ntpdate[28423]: adjust time server 192.168.38.140 offset -0.007790 sec四、chronyサーバーの構成
NTPより設定
[root@imooc-nginx ~]# sed '/^server/s/^/#/' /etc/chrony.conf -i
[root@imooc-nginx ~]# sed '1a server ntp.aliyun.com iburst' /etc/chrony.conf -i
[root@imooc-nginx ~]# sed '1a server 0.cn.pool.ntp.org iburst' /etc/chrony.conf -i
[root@imooc-nginx ~]# sed '1a server ntp1.aliyun.com iburst' /etc/chrony.conf -i
#即使当前时服务器未与指定ntp完成时间同步，照样提供服务
[root@imooc-nginx ~]# sed '1a local stratum 10' /etc/chrony.conf -i
#允许哪些服务器同步
[root@imooc-nginx ~]# sed '1a allow 192.168.0.0/16' /etc/chrony.conf -i
[root@imooc-nginx ~]# systemctl restart chronyd
[root@imooc-nginx ~]# systemctl enable chronyd
#查看chronyd状态
[root@imooc-nginx ~]# chronyc sources -v
210 Number of sources = 3
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^+ 120.25.115.20 2 6 17 4 +766us[ +591us] +/- 21ms
^- 111.230.189.174 2 6 17 4 +98us[ +98us] +/- 49ms
^* 203.107.6.88 2 6 17 4 -187us[ -361us] +/- 16ms
#测试
[root@textbox ~]# ntpdate 192.168.38.154
5 Sep 09:33:25 ntpdate[61810]: adjust time server 192.168.38.154 offset -0.010546 sec次の2つの方法の第五に、自動同期
1、ntpdateを書き込みntp.aliyun.comスケジュールされたタスク、時間ごとに同期
2、すべてのサーバーのchronyは、それまでの時間サーバ、他のサーバーのサーバーのポイントを行う一つは、開いています
第六に、タイムゾーンを設定します
[root@textbox ~]# timedatectl set-timezone Asia/Shanghai